Free WW2 MultiPlayer FPS game

http://games.activision.com/games/wolfenstein/ and click "Enemy Territory"

The following is taken from the site:
"
About Wolfenstien Enemy Territory:
Wolfenstien Enemy Territory is a free, stand-alone, downloadable multiplayer game in which players wage war as the Axis (Germany) or Allies (US, UK) in team based combat.
"

This game is more popular (Online players/servers) then Unreal Tournement, Americas Army, Battlefield 1942 and even Return to the Castle Wolfenstein. It is the third most popular multiplayer game, behing counter-strike.

NOTE: You do not need Return to the Castle Wolfenstein to play
NOTE: This is completly free

I played this for a bit on some nz servers a while back. Pretty good for a free game. Got best medic on some rounds too.